Routine Maintenance and Restoration Program

The East Bay Regional Park District is undertaking a culvert replacement and ecological restoration project at the Stewartville Trail crossing over Sand Creek in Antioch, California, under its Routine Maintenance and Restoration Program. The existing culvert, dislodged during 2023 storms, will be replaced with a 60-inch-diameter by 30-foot-long corrugated metal pipe culvert, accompanied by headwall and tail-wall rock slope protection, energy dissipators, and downstream ecological stabilization measures. These include planting native vegetation and installing willow fascines to combat stream incision and restore riparian habitat. The project is governed under the California Environmental Quality Act, with a Negative Declaration issued and mitigation measures approved by the Central Valley Regional Water Quality Control Board, ensuring compliance with state environmental standards. All work is occurring within the Black Diamond Mines Regional Preserve and Contra Loma Regional Park in Contra Costa County. The contract, identified by solicitation number 5B07CR00271, was posted on September 11, 2025, and falls under NAICS code 237990 for other heavy and civil engineering construction. No federal acquisition regulation clauses, pricing data, payment details, or contract type specifications were identified in the documentation, indicating this is a state-level project managed without federal procurement structures. Point of contact includes Brook Vinnedge as Ecological Services Coordinator and Nicholas Savino as an Environmental Scientist with the Central Valley Regional Water Quality Control Board. While environmental compliance, mitigation performance, and monitoring are key requirements, there are no publicly available details regarding contract value, delivery schedules, invoicing methods, inspection procedures, or offeror certifications. The project emphasizes ecological restoration alongside infrastructure repair, aligning with the District’s broader maintenance goals and state environmental stewardship obligations.